Dawn virginia beach, Virginia 10/8/2014 3:36:04 AM Mark,I also had a problem with my dog backing out of his collar. I felt if I went tighter with his collar, it would choke him. I left his collar as is and now when I walk him, I use his leash and a choker chain. when he tries to back out, his collar tightens and he realizes he cannot do so. He has stopped backing out of his leash but now we are working on not pulling when we walk. I am going to try the tip above which says to stop walking until his leash loosens to see how that works. I am keeping my fingers crossed!